Power supply



FIG. 1 is perspective view of a power supply showing my new design;

FIG. 2 is an alternate perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a bottom view thereof.

FIG. 9 is perspective view of another embodiment of a power supply showing my new design;

FIG. 10 is an alternate perspective view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a left side view thereof;

FIG. 13 is a rear view thereof;

FIG. 14 is a top plan view thereof;

FIG. 15 is a right side view thereof; and,

FIG. 16 is a bottom view thereof.

The even dashed lines show environment and form no part of the claimed design. 

CLAIM The ornamental design for a power supply, as shown and described. 